87123009 has 8 divisors (see below), whose sum is σ = 116209600. Its totient is φ = 58059216.

The previous prime is 87122983. The next prime is 87123041. The reversal of 87123009 is 90032178.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87123009 - 2¹¹ = 87120961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87123209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7767 + ... + 15315.

It is an arithmetic number, because the mean of its divisors is an integer number (14526200).

Almost surely, 2^87123009 is an apocalyptic number.

It is an amenable number.

87123009 is a deficient number, since it is larger than the sum of its proper divisors (29086591).

87123009 is a wasteful number, since it uses less digits than its factorization.

87123009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11399.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 87123009 is about 9333.9706984755. The cubic root of 87123009 is about 443.3134985881.

The spelling of 87123009 in words is "eighty-seven million, one hundred twenty-three thousand, nine".